$103 Find Cheap Flights from Ontario to Seattle

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Seattle departing on 9/20. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

KAYAK searches hundreds of travel sites at once for deals on flights to Seattle

Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 20% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Flights Deals
Useful Info
Flights Deals

Cheap Flights from Ontario to Seattle

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Seattle that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ontario to Seattle

Thu, Sep 4 - Sat, Sep 13
WestJet Logo
6:00 am - 12:59 pmYKF-SEA
9h 59m1 stop
WestJet Logo
1:50 pm - 12:45 amSEA-YKF
7h 55m1 stop
$185WestJet
Find Deal
Wed, Oct 15 - Thu, Oct 23
WestJet Logo
6:00 am - 12:59 pmYKF-SEA
9h 59m1 stop
WestJet Logo
7:05 am - 6:55 pmSEA-YKF
8h 50m1 stop
$186WestJet
Find Deal
Wed, Aug 20 - Wed, Sep 17
WestJet Logo
6:00 am - 12:58 pmYKF-SEA
9h 58m1 stop
WestJet Logo
1:50 pm - 12:45 amSEA-YKF
7h 55m1 stop
$190WestJet
Find Deal
Wed, Oct 8 - Wed, Oct 15
Alaska Airlines Logo
4:45 pm - 7:04 pmYYZ-SEA
5h 19mnonstop
Alaska Airlines Logo
7:18 am - 3:00 pmSEA-YYZ
4h 42mnonstop
$227Alaska Airlines
Find Deal
Fri, Nov 7 - Sun, Nov 16
Air Canada Logo
7:30 pm - 9:56 pmYYZ-SEA
5h 26mnonstop
Air Canada Logo
8:00 pm - 6:29 amSEA-YYZ
7h 29m1 stop
$231Air Canada
Find Deal
Wed, Sep 17 - Tue, Sep 23
Air Canada Logo
12:25 pm - 7:31 pmYTZ-SEA
10h 06m1 stop
Air Canada Logo
7:15 am - 7:49 pmSEA-YTZ
9h 34m1 stop
$246Air Canada
Find Deal
Wed, Sep 3 - Thu, Sep 4
United Airlines Logo
6:20 pm - 10:59 pmYYZ-SEA
7h 39m1 stop
United Airlines Logo
10:00 am - 12:50 amSEA-YYZ
11h 50m2 stops
$252United Airlines
Find Deal
Thu, Aug 14 - Thu, Aug 21
 Logo
9:55 am - 8:41 pmYXU-SEA
13h 46m2 stops
 Logo
7:35 pm - 5:14 amSEA-YXU
6h 39m1 stop
Wed, Sep 3 - Sat, Sep 6
 Logo
7:00 am - 10:59 pmYYZ-SEA
18h 59m3 stops
 Logo
7:15 am - 6:34 pmSEA-YYZ
8h 19m1 stop
Thu, Aug 14 - Thu, Aug 21
United Airlines Logo
6:15 am - 11:00 amYXU-SEA
7h 45m1 stop
United Airlines Logo
10:55 pm - 5:07 pmSEA-YXU
15h 12m2 stops
$385United Airlines
Find Deal
Useful Info

Good to know

Low seasonJanuary
High seasonAugust
Best time to beat the crowds with an average 14% drop in price.
Most popular time to fly and prices are also 4% lower on average.

FAQs for booking flights from Ontario to Seattle

  • How does KAYAK find such low prices on flights from Ontario to Seattle?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to Seattle.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Seattle?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ontario to Seattle?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Seattle with an airline and back to Ontario with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to Seattle?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Everything you need to know for your flight to Seattle

Information on the airport you'll fly into in Seattle

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.